Insulated electric cable or conductor.



T .No. 690,283. Patented Dec. 3|, l-9 0l.

G. E. HEYL-DIA.

INSULATED ELECTRIC CABLE 0B CONDUCTOR.

(Application filed July 11, 1900.) \(No Model.)

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NI TED STATES PATENT FFICE.

GEORGE EDWARD HEYL-DIA, OF MANCHESTER, ENGLAND.

INSULATED ELECTRIC CABLE OR CONDUCTOR.

SPECIFICATION forming part of Letters Patent No. 690,283, dated December31, 1901.

. Application filed July 11, 1900. Serial No. 23,239. (No model.)

Olowes street,Higher Brou ghton,l\/Ianchester,-

England,) have invented certain new and useful Improvements in InsulatedElectric Gables or Conductors, of which the following is aspecification.

In the manufacture of twin wires for electric circuits the two Wireshave hitherto been covered separately, and then the two sepa-.

rately-covered wires have been embedded in or wrapped around withfurther insulating material, involving considerable extra expense. Thisis especially the case when the wires have to be covered with strips tobe themselves nailed to walls, ceilings, and the like. The strips arehollowed out with two independent grooves to contain the two wires. 'Nowby my invention .1 cover the two wires with insulation by the sameoperation and also, when required, by the same operation insert betweenthe wires a fillet or strip of permeable material through which thenails can be driven which attach the twin wires to the wall, ceiling, orthe like.

At the present time wires are covered by a series of them being runbetween parallel grooved rollers, one wire in each groove, and on thetop and the bottom of these wires a layer of india-rubber is placed andpasses through the grooved rollers with the wires, the grooves beingsemicircular and of just sufficient diameter to allow the wire with thetightly-compressed covering of india-rubber to pass through them. When,therefore, the wires and the two rubber strips pass through, the edgesof the grooves, meeting each other, out the india-rubber and form around tube of india-rubber around each wire. Now in carrying out myinvention I slightly alter these grooved rollers. If I wish simply tohave two wires connected together, I cut away every alternate edgebetween the grooves, so as to leave a slight flat. When the wires andthe two webs of india-rubber are passed between these rollers, theindia-rubber instead of being slit between each wire and l the next isslit only between each alternate wire and the next, but is tightlycompressed around the two wires, thus forming a twin wire. If three,four, five, or more wires are desired to be attached in a single bandthe cutting edges of the rolls between these wires are cut away. Where Iwish a fillet between two wires, I unite three grooves of these rollersin one and pass the two wires, with the fillet between them, through thelong groove thus formed, together with the two coveringwebs of rubber.The rolls thus cover the fillet and the two wires with thetightly-adhering layer of india-rubber all around. It is obvious that inmaking fresh rolls it is not necessary to cut away the cutting edges,and the rolls can be spaced in any way that is desirable, so as to use alarger or smaller fillet; further, that the fillet can be nickedslightly in the center, so as to direct the points of the nails into theexact center of the fillet.

ings, in which rolling device; Fig. 2, an enlarged section of the rollsas applied for making a simple twin, and Fig. 31 enlarged sectionalrolls in my most improved design as applied to making c011- ductors forelectric-light wiring and the like.

In the drawings, A A are the rollers; B B, sharp cutting edges; 0 O,nicking edges or flats not cutting; D D, wires; E E, innercovering-strips; F F, outer covering-strips; G, fillet;H H, rollscarrying material I, finished conductor.

I declare that what I claim is- 1. An electric conductorof the twin-Wireor compound type, having a fillet of permeable material insertedcentrally between the wires and within the insulating covering of thewires, substantially as and for the purpose set forth.

2. An electric conductor of the twin-wire or compound type, comprising aplurality of conductors, a fillet of permeable material between adjacentconductors and an insulatingcovering inclosing said conductors andfillet, substantially as described.

3. An electric conductor of the twin-wire or compound type, comprising aplurality of con- In order that my invention may be further Iunderstood, I append the accompanying draw- Figure l is a diagrammaticsketch of the duetors, a fillet of permeable material be- I my name this26th daypf June, 1900, in the tween adjacent conductors and aninsulatingpresence of two snbscrlbing wlinesses.

coverin inclosin said conductors and fillet 1 the insalating-cgveringand fillet havingii GEORGE EDWARD HLYL-DIA' 5 central longitudinalniek,substantia1ly as and WVitnesses:

for the purpose set forth. A. F. STEVENSON,

In witness whereof I have hereunto signed N. W. MEDLEY.

